物理：Two hockey players on ice skates push off of each other.

物理：Two hockey players on ice skates push off of each other. One has a mass m1 of 63 kilograms.
(a) If the 92 kilogram player moves back with a velocity of 2.4 m/sec, what is his momentum?
（220.8）kg·m/sec
(b) What is the 63 kilogram player's momentum?
（ ） kg·m/sec
(c) What is the 63 kilogram player's velocity?
（ ） m/sec
m2 of 92 kilograms